CVE-2023-26040

Discourse chat messages susceptible to Cross-site Scripting through chat excerpts

Description

Discourse is an open-source discussion platform. Between versions 3.1.0.beta2 and 3.1.0.beta3 of the `tests-passed` branch, editing or responding to a chat message containing malicious content could lead to a cross-site scripting attack. This issue is patched in version 3.1.0.beta3 of the `tests-passed` branch. There are no known workarounds.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.18%
Vendor Advisory github.com
Affected: discourse discourse
Published at:
Updated at:

References

Link Tags
https://github.com/discourse/discourse/security/advisories/GHSA-ccfc-qpmp-gq87 vendor advisory
https://github.com/discourse/discourse/commit/a373bf2a01488c206e7feb28a9d2361b22ce6e70 patch

Frequently Asked Questions

What is the severity of CVE-2023-26040?
CVE-2023-26040 has been scored as a medium severity vulnerability.
How to fix CVE-2023-26040?
To fix CVE-2023-26040, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-26040 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-26040 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-26040?
CVE-2023-26040 affects discourse discourse.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.